Hayward FD Heater Bypass Cartridge Kit — Fits Universal H-Series Low NOx Heaters

Bypass cartridge kit for Hayward FD-series pool heaters. Compatible with Hayward Universal H‑Series Low NOx pool heater models: h150fdn, h150fdp, h200fdn, h200fdp, h250fdn, h250fdp, h300fdn, h300fdp, h350fdn, h350fdp, h400fdn, h400fdp. Package weight: 2.7 pounds.